The only tennis court that falls under the jurisdiction of the central bank.

A memorial to a shareholder activist feared by CEOs around the United States.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

A line of blue paint marks the route of the inaugural parade.

These abandoned waterworks are crumbling into the Potomac River.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

Every drop of D.C. tap water flows through this old waterworks.

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

The school tested mustard gas for the U.S. Army during World War I.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

A building shaped like the Army Corps of Engineers logo, because why not?

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.